2026
09/11
OPEN
Date
2026/09/11（Fri.）11:00 – 12:00
Venue
PF Research Build. 2nd floor conf. room + Zoom
Speaker
Dr. Thanapong Phimsen
Language
English
URL
Contact
Yasunori Tanimoto (PHS 4713)
The vacuum system for the Siam Photon Source II (SPS-II), Thailand’s upcoming fourth-generation synchrotron light source, must accommodate tight spatial constraints and sub-millimeter clearances imposed by a compact lattice. This talk presents the comprehensive development of the vacuum infrastructure, integrating engineering simulations with physical prototyping and ultra-high vacuum (UHV) verification. The design relies on a localized pumping strategy that concentrates high-capacity pumps near discrete copper photon absorbers. Finite Element Analysis (FEA) validates the mechanical design, demonstrating that an optimized support system minimizes deformation at critical beam position monitors under thermal loads while keeping peak absorber temperatures within safe operational limits. Furthermore, Molflow+ simulations predict achievable operational average pressures following beam conditioning. To validate the manufacturing workflow, prototype aluminum chambers targeting key fabrication challenges were produced using oil-less CNC machining. Metrology confirmed that geometric deformations remained well within specified tolerances, ensuring safe clearances at all magnetic interfaces. Finally, surface characterization and thermal outgassing measurements on chemically cleaned components benchmarked domestic manufacturing capabilities. This integrated approach establishes a direct correlation between surface chemistry and vacuum performance, demonstrating that the localized pumping strategy and precision domestic manufacturing framework are fully viable for meeting the stringent UHV requirements of the SPS-II.